package com.baizhi;

import java.util.HashMap;
import java.util.Map;

public class Cpx {
    public static void main(String[] args) {
        // cpx！
        System.out.println("This is cpx！");
        Map map=new HashMap();
        Object put = map.put(1, "1");
        Object put1 = map.put("", "1");
        System.out.println(put1);
    }
}
